Find the lengths of the diagonals of rectangle JKLM if JL = 3x + 4 and KM
= 4x - 1.
20 points

Step-by-step explanation:

they intersect so their equal to each other so first you wanna find x.

3x + 4 = 4x - 1

-3x         -3x

4 = x - 1

+1      +1

5 = x

then plug in x on each diagonals JL and KM.

JL= 3(5) + 4 = 19

KM = 4(5) - 1 = 19

SEE? THEY ARE EQUAL WHICH MEANS MY ANSWER IS CORRECT.:)

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

i am thinking c. sorry if im wrong .

step-by-step explanation: